ICASE(), what is ICASE

Code:

mname1 = "Shyam"

mtotpercent1 = 45

mClass1 = GetClass(mname1,mtotpercent1)

MESSAGEBOX(mClass1,0+654,"Class Type")

mname2 = "Ram"

mtotpercent2 = 59

mClass2 = GetClass(mname2,mtotpercent2)

MESSAGEBOX(mClass2,0+654,"Class Type")

mname3 = "Hussain"

mtotpercent3 = 78

mClass3 = GetClass(mname3,mtotpercent3)

MESSAGEBOX(mClass3,0+654,"Class Type")

mname4 = "John"

mtotpercent4 = 100

mClass4 = GetClass(mname4,mtotpercent4)

MESSAGEBOX(mClass4,0+654,"Class Type")

PROCEDURE GetClass

LPARAMETERS StudentName,TotPercent

RETURN ICASE(TotPercent <= 45 , "Pass Class", TotPercent <= 59.99,"Second Class", TotPercent <=99.99 ,"First Class","Merit")